Last year I purchased a set of red gloves from Omnipole.  They're extremely thick, 100% water proof and wool lined.
Very toasty.  I think they were about £36.00.
They're a little bit bulky for trad, but excellent for WFP, but I still do use them for trad though.  They're very easy and quick to pull on or off, so I wash and squeegie a whole load of windows with the gloves on, then remove my right glove and detail.
I suffer from dermatitus, so I'm more concerned with keeping the detergent off my hands, than keeping my hands warm.  
You'll have to Google for them from the Omnipole site.
I also use a heavy-duty marigold with a cotton liner.  The liners are available for a couple of quid from Boots.  Buy an extra-large heavy-duty marigold and a medium inner.
Unless you've hands like shovels, they should fit okay.